Implement va_arg for Hexagon Linux musl targets #150008
Open
+87
−1
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
rustbot
added
A-LLVM
Collaborator
This comment has been minimized.
This comment has been minimized.
Contributor
Author
|
cc @folkertdev Tested with #150009 #150010, and this |
Implements proper variadic argument handling for hexagon-unknown-linux-musl targets using a 3-pointer VaList structure compatible with LLVM's HexagonBuiltinVaList implementation. * Handles register save area vs overflow area transition * Provides proper 4-byte and 8-byte alignment for arguments * Only activates for hexagon+musl targets via Arch::Hexagon & Env::Musl
androm3da
force-pushed
the
bcain/va_arg_rs
branch
from
961715a to
0c1612e
Compare
Collaborator
|
This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed. Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers. |
Contributor
|
@rustbot reroll |
Contributor
|
r? folkertdev |
folkertdev
reviewed
Dec 15, 2025
Contributor
There was a problem hiding this comment.
On its own this will miscompile, so maybe you can copy the changes from #149967 and just add them to this commit.
| // This includes `target.is_like_darwin`, which on x86_64 targets is like sysv64. | ||
| Arch::X86_64 => emit_x86_64_sysv64_va_arg(bx, addr, target_ty), | ||
| Arch::Xtensa => emit_xtensa_va_arg(bx, addr, target_ty), | ||
| Arch::Hexagon if target.env == Env::Musl => emit_hexagon_va_arg(bx, addr, target_ty), |
Contributor
There was a problem hiding this comment.
I'd like to make this match exhaustive soon, so could you also add the non-musl HexagonABIInfo::EmitVAArgForHexagon logic? I think that actually manually implements emitVoidPtrVAArg (which we translate as emit_ptr_va_arg in this module) but maybe there is some subtle difference
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
5 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Implements proper variadic argument handling for hexagon-unknown-linux-musl targets using a 3-pointer VaList structure compatible with LLVM's HexagonBuiltinVaList implementation.